Here is the full list of all 121 The Madness of Little Emma achievements.
Kill Sinister Mask
Kill all bosses in episode 3
Kill Summer
Kill 4 Seasons
Kill Winter
Buy 5 items in one playthrough
Kill Spring
Kill Autumn
Unlock first ending
Kill Manless Face
Kill Meat Bag
Kill all bosses in episode 2
Kill the fat man
Complete episode 1 without collecting hearts and healing herbs
Destroy a turnip
Get very unlucky
Have only 1 heart container
Unlock Lucretia
Kill Alice
Reach Misery
Kill Red Viper
Kill Entozoon
Kill all bosses in episode 1
Collect 5 health bonuses in one game
Unlock Amelia
Find Love Burrow
Find a red chest
Kill Haunt
Reach Undergrounds
Reach Den
Unlock Elizabeth
Kill Green Viper
Kill Liquid Sisters
Find a secret
Die
Kill a boss
Kill Mask
Reach The Riddle
Unlock second ending
Unlock third ending
Unlock final ending
Kill all bosses in episode 4
Kill April
Find everything
Complete ending 4 with clean mind all the time
Get really insane!
Get very lucky
Unlock every other achievement
Complete episode 2 without collecting hearts and healing herbs
Complete episode 3 without collecting hearts and healing herbs
Complete episode 4 without collecting hearts and healing herbs
Kill a shopkeeper
Kill Eidolon
Kill Spirit
Find all Love Items
Unlock fifth ending
Unlock sixth ending
Kill Manless Face as Amelia
Unlock Marah
Unlock Chloe
Complete Arena as Emma
Complete Arena
Complete Arena as Lucretia
Complete Arena as Elizabeth
Complete Arena as Amelia
Complete Arena as Marah
Complete Arena as Chloe